iOS: clean-up header includes

Try to keep qiosglobal.h free from unnecessary includes, since its
typically included from many different locations.

Change-Id: I6638bcaef1189b3eee3dbd5f744c15f8f7858d71
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>

src/plugins/platforms/ios/qiosglobal.h

@@ -43,9 +43,7 @@
 #define QIOSGLOBAL_H
 
 #import <UIKit/UIKit.h>
-#import <QtCore/qglobal.h>
-#import <QtGui/qguiapplication.h>
-#import "qiosscreen.h"
+#include <QtCore/QtCore>
 
 @class QIOSViewController;
 

src/plugins/platforms/ios/qiosglobal.mm

@@ -42,7 +42,7 @@
 #include "qiosglobal.h"
 #include "qiosapplicationdelegate.h"
 #include "qiosviewcontroller.h"
-#include <QtGui/qscreen.h>
+#include "qiosscreen.h"
 
 QT_BEGIN_NAMESPACE